gpx_fillrect
static void gpx_fillrect(struct gpx_screen *, int, int, int, int, long, u_int);
gpx_fillrect(ss, dx, dy + font->fontheight - 2, font->fontwidth,
gpx_fillrect(ss, x, y, dx, dy, attr, LF_R2); /* bg fill */
gpx_fillrect(ss, x, y, dx, dy, attr, LF_R2); /* bg fill */
gpx_fillrect(ss, x, y, w, h, WSCOL_WHITE << 24, LF_R4); /* invert */